— How long ____ you ____ in Singapore?

— For just the weekend. I'll be back next Monday morning.[ ]

A. have; stayed

B. are; staying

C. did; stay

D. do; stay

产妇，28岁，产后3d，一直坚持母乳喂养，现 * * 红、皲裂、哺乳时疼痛，其最可能的原因是

A．新生儿含接姿势不正确

B．新生儿吸吮次数过多

C．新生儿吸吮用力过大

D．产前 * * 护理不足

E．乳汁过少